Cecil Moore wrote:
Rectifier wrote:
Radiation has no mass ...

On the contrary, radiation is photons which indeed
do have mass when traveling at the speed of light,
which radiation does.

According to Einstein, anything with energy has mass equivalence -
especially photons. But other than that, nothing with mass can travel
at the speed of light. You can have one, or the other, not both.

73, ac6xg